Electrical and magnetic properties of Bi5FeTi3O15 compound prepared by inserting BiFeO3 into Bi4Ti3O12

A novel four-layer Bi5FeTi3O15(BFTo) compound was synthesized via sintering the mixture of Fe2O3, Bi2O3 oxides and already-prepared Bi4Ti3O12 powders. At room temperature, the remnant polarization (2P(r)) and the coercive field (2E(c)) of Bi5FeTi3O15 samples were about 11.8 mu C/cm(2) and 270 kV/cm, respectively. The BFTO samples show a weak ferromagnetism with M-r approximate to 1.36 x 10(-6) emu/g. A sharp dielectric peak was found, showing that the arrangement Of iron ions in each crystal unit maybe relatively in order. Two peaks were found in the tan delta - T Curves. The peak at lower temperature (similar to 400 degrees C) behaves relaxation characteristic, with the activation energy (H) of about 1.62 eV and the upper peak is frequency independent. (c) 2008 Elsevier Ltd. All rights reserved.